Characterization of novel aluminium powders for the development of components using the powder metallurgy process.

使用粉末冶金工艺开发部件的新型铝粉末的表征。

• 批准号: 534004-2018
• 负责人: Blais, Carl
• 金额: $ 1.82万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=645590
• 关键词: Characterization; novel; aluminium; powders; development

Aluminium components produced by the Powder Metallurgy process generally require additions of magnesium to promote liquid-phase singeing. Indeed, melting of magnesium during sintering mechanically disrupt the oxide layer found at the surface of Al particles while acting as a scavenger for residual oxygen molecules found in the surrounding sintering atmosphere. This strategy promotes the formation of numerous metal-metal points of contact that act as nucleation sites for the formation and growth of sintered necks. Although this approach yields components with good mechanical properties, parts produced by this route sustain significant distortion, which typically requires secondary shaping operations to give them their desired shape. ****Equispheres Inc. has developed a unique process for manufacturing spherical metal powders. The latter are renowned for having a significantly thinner oxide layer than powders of identical alloys produced by inert gas atomization. Therefore, it is postulated that this thin oxide layer could be mechanically disrupted during the compaction stage of the PM process, therefore requiring much less magnesium, if any, during sintering. The final outcome would be the production of PM Al components that would require minimal secondary shaping operation and possibly none a tall.****The work carried out in this project will seek to maximize the compressibility of Al powders by developing synthetic particle size distributions. Additionally, optimization will be done to determine the ideal thermal profile for sintering as a function of green density and magnesium content. Finally, the effect of the latter parameters on specimen distortion and tensile mechanical properties will be quantified.****

通过粉末冶金工艺生产的铝部件通常需要添加镁以促进液相烧毛。实际上，在烧结期间镁的熔化机械地破坏在Al颗粒表面处发现的氧化物层，同时充当在周围烧结气氛中发现的残留氧分子的清除剂。这种策略促进了许多金属-金属接触点的形成，这些接触点充当烧结颈部形成和生长的成核位点。虽然这种方法产生具有良好机械性能的部件，但通过这种路线生产的部件会承受显著的变形，这通常需要二次成形操作来赋予它们所需的形状。****Equispheres Inc.开发了一种制造球形金属粉末的独特工艺。后者以具有比通过惰性气体雾化产生的相同合金的粉末显著更薄的氧化物层而闻名。因此，假设该薄氧化物层可以在PM工艺的压实阶段期间被机械地破坏，因此在烧结期间需要少得多的镁（如果有的话）。最终的结果将是生产粉末冶金铝部件，这将需要最少的二次成型操作，可能没有一个高的。在这个项目中进行的工作将寻求通过开发合成粒度分布来最大限度地提高Al粉末的可压缩性。此外，将进行优化以确定作为绿色密度和镁含量的函数的用于烧结的理想热分布。最后，将量化后面参数对试样变形和拉伸机械性能的影响。*